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gimp/plug-ins/common/warp.c

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/* Warp --- image filter plug-in for GIMP
* Copyright (C) 1997 John P. Beale
* Much of the 'warp' is from the Displace plug-in: 1996 Stephen Robert Norris
* Much of the 'displace' code taken in turn from the pinch plug-in
* which is by 1996 Federico Mena Quintero
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* You can contact me (the warp author) at beale@best.com
* Please send me any patches or enhancements to this code.
* You can contact the original GIMP authors at gimp@xcf.berkeley.edu
*
* --------------------------------------------------------------------
* Warp Program structure: after running the user interface and setting the
* parameters, warp generates a brand-new image (later to be deleted
* before the user ever sees it) which contains two grayscale layers,
* representing the X and Y gradients of the "control" image. For this
* purpose, all channels of the control image are summed for a scalar
* value at each pixel coordinate for the gradient operation.
*
* The X,Y components of the calculated gradient are then used to
* displace pixels from the source image into the destination
* image. The displacement vector is rotated a user-specified amount
* first. This displacement operation happens iteratively, generating
* a new displaced image from each prior image.
* -------------------------------------------------------------------
*
* Revision History:
* Version 0.37 12/19/98 Fixed Tooltips and freeing memory
* Version 0.36 11/9/97 Changed XY vector layers back to own image
* fixed 'undo' problem (hopefully)
*
* Version 0.35 11/3/97 Added vector-map, mag-map, grad-map to
* diff vector instead of separate operation
* further futzing with drawable updates
* starting adding tooltips
*
* Version 0.34 10/30/97 'Fixed' drawable update problem
* Added 16-bit resolution to differential map
* Added substep increments for finer control
*
* Version 0.33 10/26/97 Added 'angle increment' to user interface
*
* Version 0.32 10/25/97 Added magnitude control map (secondary control)
* Changed undo behavior to be one undo-step per warp call.
*
* Version 0.31 10/25/97 Fixed src/dest pixregions so program works
* with multiple-layer images. Still don't know
* exactly what I did to fix it :-/ Also, added 'color' option
* for border pixels to use the current selected foreground color.
*
* Version 0.3 10/20/97 Initial release for Gimp 0.99.xx
*/
#include "config.h"
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
/* Some useful macros */
#define PLUG_IN_PROC "plug-in-warp"
#define PLUG_IN_BINARY "warp"
#define PLUG_IN_ROLE "gimp-warp"
#define ENTRY_WIDTH 75
#define MIN_ARGS 6 /* minimum number of arguments required */
enum
{
WRAP,
SMEAR,
BLACK,
COLOR
};
typedef struct _Warp Warp;
typedef struct _WarpClass WarpClass;
struct _Warp
{
GimpPlugIn parent_instance;
};
struct _WarpClass
{
GimpPlugInClass parent_class;
};
#define WARP_TYPE (warp_get_type ())
#define WARP(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), WARP_TYPE, Warp))
GType warp_get_type (void) G_GNUC_CONST;
static GList * warp_query_procedures (GimpPlugIn *plug_in);
static GimpProcedure * warp_create_procedure (GimpPlugIn *plug_in,
const gchar *name);
static GimpValueArray * warp_run (GimpProcedure *procedure,
GimpRunMode run_mode,
GimpImage *image,
GimpDrawable **drawables,
GimpProcedureConfig *config,
gpointer run_data);
static void blur16 (GimpDrawable *drawable);
static void diff (GimpDrawable *drawable,
GimpProcedureConfig *config,
GimpDrawable **xl,
GimpDrawable **yl);
static void diff_prepare_row (GeglBuffer *buffer,
const Babl *format,
guchar *data,
gint x,
gint y,
gint w);
static void warp_one (GimpDrawable *draw,
GimpDrawable *newid,
GimpDrawable *map_x,
GimpDrawable *map_y,
GimpDrawable *mag_draw,
gboolean first_time,
gint step,
GimpProcedureConfig *config);
static void warp (GimpDrawable *drawable,
GimpProcedureConfig *config);
static gboolean warp_dialog (GimpDrawable *drawable,
GimpProcedure *procedure,
GimpProcedureConfig *config);
static void warp_pixel (GeglBuffer *buffer,
const Babl *format,
gint width,
gint height,
gint x1,
gint y1,
gint x2,
gint y2,
gint x,
gint y,
guchar *pixel,
GimpProcedureConfig *config);
static gdouble warp_map_mag_give_value (guchar *pt,
gint alpha,
gint bytes);
G_DEFINE_TYPE (Warp, warp, GIMP_TYPE_PLUG_IN)
GIMP_MAIN (WARP_TYPE)
DEFINE_STD_SET_I18N
static gint progress = 0; /* progress indicator bar */
static GimpRunMode run_mode; /* interactive, non-, etc. */
static guchar color_pixel[4] = {0, 0, 0, 255}; /* current fg color */
static void
warp_class_init (WarpClass *klass)
{
GimpPlugInClass *plug_in_class = GIMP_PLUG_IN_CLASS (klass);
plug_in_class->query_procedures = warp_query_procedures;
plug_in_class->create_procedure = warp_create_procedure;
plug_in_class->set_i18n = STD_SET_I18N;
}
static void
warp_init (Warp *warp)
{
}
static GList *
warp_query_procedures (GimpPlugIn *plug_in)
{
return g_list_append (NULL, g_strdup (PLUG_IN_PROC));
}
static GimpProcedure *
warp_create_procedure (GimpPlugIn *plug_in,
const gchar *name)
{
GimpProcedure *procedure = NULL;
if (! strcmp (name, PLUG_IN_PROC))
{
procedure = gimp_image_procedure_new (plug_in, name,
GIMP_PDB_PROC_TYPE_PLUGIN,
warp_run, NULL, NULL);
gimp_procedure_set_image_types (procedure, "RGB*, GRAY*");
gimp_procedure_set_sensitivity_mask (procedure,
GIMP_PROCEDURE_SENSITIVE_DRAWABLE);
gimp_procedure_set_menu_label (procedure, _("_Warp..."));
gimp_procedure_add_menu_path (procedure, "<Image>/Filters/Map");
gimp_procedure_set_documentation (procedure,
_("Twist or smear image in many "
"different ways"),
_("Smears an image along vector paths "
"calculated as the gradient of a "
"separate control matrix. The effect "
"can look like brushstrokes of acrylic "
"or watercolor paint, in some cases."),
name);
gimp_procedure_set_attribution (procedure,
"John P. Beale",
"John P. Beale",
"1997");
gimp_procedure_add_double_argument (procedure, "amount",
_("Step si_ze"),
_("Pixel displacement multiplier"),
-G_MAXDOUBLE, G_MAXDOUBLE, 10.0,
G_PARAM_READWRITE);
gimp_procedure_add_drawable_argument (procedure, "warp-map",
_("Dis_placement Map"),
_("Displacement control map"),
TRUE,
G_PARAM_READWRITE);
gimp_procedure_add_int_argument (procedure, "iter",
_("I_terations"),
_("Iteration count"),
1, 100, 5,
G_PARAM_READWRITE);
gimp_procedure_add_double_argument (procedure, "dither",
_("_Dither size"),
_("Random dither amount"),
0, 100, 0.0,
G_PARAM_READWRITE);
gimp_procedure_add_double_argument (procedure, "angle",
_("Rotatio_n angle"),
_("Angle of gradient vector rotation"),
0, 360, 90.0,
G_PARAM_READWRITE);
gimp_procedure_add_choice_argument (procedure, "wrap-type",
_("On ed_ges"),
_("Wrap type"),
gimp_choice_new_with_values ("wrap", WRAP, _("Wrap"), NULL,
"smear", SMEAR, _("Smear"), NULL,
"black", BLACK, _("Black"), NULL,
"color", COLOR, _("Foreground Color"), NULL,
NULL),
"wrap",
G_PARAM_READWRITE);
gimp_procedure_add_drawable_argument (procedure, "mag-map",
_("_Magnitude Map"),
_("Magnitude control map"),
TRUE,
G_PARAM_READWRITE);
gimp_procedure_add_boolean_argument (procedure, "mag-use",
_("_Use magnitude map"),
_("Use magnitude map"),
FALSE,
G_PARAM_READWRITE);
gimp_procedure_add_int_argument (procedure, "substeps",
_("Su_bsteps"),
_("Substeps between image updates"),
1, 100, 1,
G_PARAM_READWRITE);
gimp_procedure_add_drawable_argument (procedure, "grad-map",
_("Gradient Ma_p"),
_("Gradient control map"),
TRUE,
G_PARAM_READWRITE);
gimp_procedure_add_double_argument (procedure, "grad-scale",
_("Gradient s_cale"),
_("Scaling factor for gradient map (0=don't use)"),
-G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
G_PARAM_READWRITE);
gimp_procedure_add_drawable_argument (procedure, "vector-map",
_("_Vector Map"),
_("Fixed vector control map"),
TRUE,
G_PARAM_READWRITE);
gimp_procedure_add_double_argument (procedure, "vector-scale",
_("Vector magn_itude"),
_("Scaling factor for fixed vector map (0=don't use)"),
-G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
G_PARAM_READWRITE);
gimp_procedure_add_double_argument (procedure, "vector-angle",
_("Ang_le"),
_("Angle for fixed vector map"),
0, 360, 0.0,
G_PARAM_READWRITE);
}
return procedure;
}
static GimpValueArray *
warp_run (GimpProcedure *procedure,
GimpRunMode _run_mode,
GimpImage *image,
GimpDrawable **drawables,
GimpProcedureConfig *config,
gpointer run_data)
{
GimpDrawable *drawable;
GeglColor *color;
gegl_init (NULL, NULL);
if (gimp_core_object_array_get_length ((GObject **) drawables) != 1)
{
GError *error = NULL;
g_set_error (&error, GIMP_PLUG_IN_ERROR, 0,
_("Procedure '%s' only works with one drawable."),
PLUG_IN_PROC);
return gimp_procedure_new_return_values (procedure,
GIMP_PDB_CALLING_ERROR,
error);
}
else
{
drawable = drawables[0];
}
/* get currently selected foreground pixel color */
color = gimp_context_get_foreground ();
gegl_color_get_pixel (color, babl_format ("R'G'B' u8"), color_pixel);
g_object_unref (color);
run_mode = _run_mode;
/* Initialize maps for GUI */
if (run_mode == GIMP_RUN_INTERACTIVE)
g_object_set (config,
"warp-map", drawable,
"mag-map", drawable,
"grad-map", drawable,
"vector-map", drawable,
NULL);
if (run_mode == GIMP_RUN_INTERACTIVE &&
! warp_dialog (drawable, procedure, config))
return gimp_procedure_new_return_values (procedure,
GIMP_PDB_CANCEL,
NULL);
warp (drawable, config);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
return gimp_procedure_new_return_values (procedure, GIMP_PDB_SUCCESS, NULL);
}
static gboolean
warp_dialog (GimpDrawable *drawable,
GimpProcedure *procedure,
GimpProcedureConfig *config)
{
GtkWidget *dialog;
GtkWidget *hbox;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY);
dialog = gimp_procedure_dialog_new (procedure,
GIMP_PROCEDURE_CONFIG (config),
_("Warp"));
/* Basic Options */
gimp_procedure_dialog_fill_box (GIMP_PROCEDURE_DIALOG (dialog),
"basic-options-left",
"amount", "iter", "wrap-type",
NULL);
hbox = gimp_procedure_dialog_fill_box (GIMP_PROCEDURE_DIALOG (dialog),
"basic-options-hbox",
"basic-options-left",
"warp-map",
NULL);
gtk_orientable_set_orientation (GTK_ORIENTABLE (hbox),
GTK_ORIENTATION_HORIZONTAL);
gtk_box_set_spacing (GTK_BOX (hbox), 12);
gtk_box_set_homogeneous (GTK_BOX (hbox), TRUE);
gimp_procedure_dialog_get_label (GIMP_PROCEDURE_DIALOG (dialog),
"basic-options-label", _("Basic Options"),
FALSE, FALSE);
gimp_procedure_dialog_fill_frame (GIMP_PROCEDURE_DIALOG (dialog),
"basic-options-frame",
"basic-options-label", FALSE,
"basic-options-hbox");
/* Advanced Options */
gimp_procedure_dialog_fill_box (GIMP_PROCEDURE_DIALOG (dialog),
"advanced-options-left",
"dither", "angle", "substeps",
NULL);
gimp_procedure_dialog_fill_box (GIMP_PROCEDURE_DIALOG (dialog),
"advanced-options-right",
"mag-map", "mag-use",
NULL);
hbox = gimp_procedure_dialog_fill_box (GIMP_PROCEDURE_DIALOG (dialog),
"advanced-options-hbox",
"advanced-options-left",
"advanced-options-right",
NULL);
gtk_orientable_set_orientation (GTK_ORIENTABLE (hbox),
GTK_ORIENTATION_HORIZONTAL);
gtk_box_set_spacing (GTK_BOX (hbox), 12);
gtk_box_set_homogeneous (GTK_BOX (hbox), TRUE);
gimp_procedure_dialog_get_label (GIMP_PROCEDURE_DIALOG (dialog),
"advanced-options-label",
_("Advanced Options"),
FALSE, FALSE);
gimp_procedure_dialog_fill_frame (GIMP_PROCEDURE_DIALOG (dialog),
"advanced-options-frame",
"advanced-options-label", FALSE,
"advanced-options-hbox");
/* More Advanced Options */
gimp_procedure_dialog_fill_box (GIMP_PROCEDURE_DIALOG (dialog),
"more-advanced-options-left",
"grad-scale", "vector-scale",
"vector-angle",
NULL);
hbox = gimp_procedure_dialog_fill_box (GIMP_PROCEDURE_DIALOG (dialog),
"more-advanced-options-hbox",
"more-advanced-options-left",
"grad-map", "vector-map",
NULL);
gtk_orientable_set_orientation (GTK_ORIENTABLE (hbox),
GTK_ORIENTATION_HORIZONTAL);
gtk_box_set_spacing (GTK_BOX (hbox), 12);
gtk_box_set_homogeneous (GTK_BOX (hbox), TRUE);
gimp_procedure_dialog_get_label (GIMP_PROCEDURE_DIALOG (dialog),
"more-advanced-options-label",
_("More Advanced Options"),
FALSE, FALSE);
gimp_procedure_dialog_fill_frame (GIMP_PROCEDURE_DIALOG (dialog),
"more-advanced-options-frame",
"more-advanced-options-label", FALSE,
"more-advanced-options-hbox");
/* Show dialog */
gimp_procedure_dialog_fill (GIMP_PROCEDURE_DIALOG (dialog),
"basic-options-frame",
"advanced-options-frame",
"more-advanced-options-frame",
NULL);
gtk_widget_set_visible (dialog, TRUE);
run = gimp_procedure_dialog_run (GIMP_PROCEDURE_DIALOG (dialog));
gtk_widget_destroy (dialog);
return run;
}
/* ---------------------------------------------------------------------- */
static const Babl *
get_u8_format (GimpDrawable *drawable)
{
if (gimp_drawable_is_rgb (drawable))
{
if (gimp_drawable_has_alpha (drawable))
return babl_format ("R'G'B'A u8");
else
return babl_format ("R'G'B' u8");
}
else
{
if (gimp_drawable_has_alpha (drawable))
return babl_format ("Y'A u8");
else
return babl_format ("Y' u8");
}
}
static void
blur16 (GimpDrawable *drawable)
{
/* blur a 2-or-more byte-per-pixel drawable,
* 1st 2 bytes interpreted as a 16-bit height field.
*/
GeglBuffer *src_buffer;
GeglBuffer *dest_buffer;
const Babl *format;
gint width, height;
gint src_bytes;
gint dest_bytes;
gint dest_bytes_inc;
gint offb, off1;
guchar *dest, *d; /* pointers to rows of X and Y diff. data */
guchar *prev_row, *pr;
guchar *cur_row, *cr;
guchar *next_row, *nr;
guchar *tmp;
gint row, col; /* relating to indexing into pixel row arrays */
gint x1, y1, x2, y2;
gdouble pval; /* average pixel value of pixel & neighbors */
/* --------------------------------------- */
if (! gimp_drawable_mask_intersect (drawable,
&x1, &y1, &width, &height))
return;
x2 = x1 + width;
y2 = y1 + height;
width = gimp_drawable_get_width (drawable); /* size of input drawable*/
height = gimp_drawable_get_height (drawable);
format = get_u8_format (drawable);
/* bytes per pixel in SOURCE drawable, must be 2 or more */
src_bytes = babl_format_get_bytes_per_pixel (format);
dest_bytes = src_bytes; /* bytes per pixel in SOURCE drawable, >= 2 */
dest_bytes_inc = dest_bytes - 2; /* this is most likely zero, but I guess it's more conservative... */
/* allocate row buffers for source & dest. data */
prev_row = g_new (guchar, (x2 - x1 + 2) * src_bytes);
cur_row = g_new (guchar, (x2 - x1 + 2) * src_bytes);
next_row = g_new (guchar, (x2 - x1 + 2) * src_bytes);
dest = g_new (guchar, (x2 - x1) * src_bytes);
/* initialize the pixel regions (read from source, write into dest) */
src_buffer = gimp_drawable_get_buffer (drawable);
dest_buffer = gimp_drawable_get_shadow_buffer (drawable);
pr = prev_row + src_bytes; /* row arrays are prepared for indexing to -1 (!) */
cr = cur_row + src_bytes;
nr = next_row + src_bytes;
diff_prepare_row (src_buffer, format, pr, x1, y1, (x2 - x1));
diff_prepare_row (src_buffer, format, cr, x1, y1+1, (x2 - x1));
/* loop through the rows, applying the smoothing function */
for (row = y1; row < y2; row++)
{
/* prepare the next row */
diff_prepare_row (src_buffer, format, nr, x1, row + 1, (x2 - x1));
d = dest;
for (col = 0; col < (x2 - x1); col++) /* over columns of pixels */
{
offb = col*src_bytes; /* base of byte pointer offset */
off1 = offb+1; /* offset into row arrays */
pval = (256.0 * pr[offb - src_bytes] + pr[off1 - src_bytes] +
256.0 * pr[offb] + pr[off1] +
256.0 * pr[offb + src_bytes] + pr[off1 + src_bytes] +
256.0 * cr[offb - src_bytes] + cr[off1 - src_bytes] +
256.0 * cr[offb] + cr[off1] +
256.0 * cr[offb + src_bytes] + cr[off1 + src_bytes] +
256.0 * nr[offb - src_bytes] + nr[off1 - src_bytes] +
256.0 * nr[offb] + nr[off1] +
256.0 * nr[offb + src_bytes]) + nr[off1 + src_bytes];
pval /= 9.0; /* take the average */
*d++ = (guchar) (((gint) pval) >> 8); /* high-order byte */
*d++ = (guchar) (((gint) pval) % 256); /* low-order byte */
d += dest_bytes_inc; /* move data pointer on to next destination pixel */
}
/* store the dest */
gegl_buffer_set (dest_buffer, GEGL_RECTANGLE (x1, row, (x2 - x1), 1), 0,
format, dest,
GEGL_AUTO_ROWSTRIDE);
/* shuffle the row pointers */
tmp = pr;
pr = cr;
cr = nr;
nr = tmp;
if ((row % 8) == 0)
gimp_progress_update ((double) row / (double) (y2 - y1));
}
g_object_unref (src_buffer);
g_object_unref (dest_buffer);
gimp_progress_update (1.0);
gimp_drawable_merge_shadow (drawable, TRUE);
gimp_drawable_update (drawable, x1, y1, (x2 - x1), (y2 - y1));
g_free (prev_row); /* row buffers allocated at top of fn. */
g_free (cur_row);
g_free (next_row);
g_free (dest);
}
/* ====================================================================== */
/* Get one row of pixels from the PixelRegion and put them in 'data' */
static void
diff_prepare_row (GeglBuffer *buffer,
const Babl *format,
guchar *data,
gint x,
gint y,
gint w)
{
gint bpp = babl_format_get_bytes_per_pixel (format);
gint b;
/* y = CLAMP (y, 0, pixel_rgn->h - 1); FIXME? */
gegl_buffer_get (buffer, GEGL_RECTANGLE (x, y, w, 1), 1.0,
format, data,
GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
/* Fill in edge pixels */
for (b = 0; b < bpp; b++)
{
data[b - (gint) bpp] = data[b];
data[w * bpp + b] = data[(w - 1) * bpp + b];
}
}
/* -------------------------------------------------------------------------- */
/* 'diff' combines the input drawables to prepare the two */
/* 16-bit (X,Y) vector displacement maps */
/* -------------------------------------------------------------------------- */
static void
diff (GimpDrawable *drawable,
GimpProcedureConfig *config,
GimpDrawable **xl,
GimpDrawable **yl)
{
GimpDrawable *draw_xd;
GimpDrawable *draw_yd; /* vector disp. drawables */
GimpImage *image; /* image holding X and Y diff. arrays */
GimpImage *new_image; /* image holding X and Y diff. layers */
GList *selected_layers; /* currently selected layers */
GimpLayer *xlayer;
GimpLayer *ylayer; /* individual X and Y layer ID numbers */
GeglBuffer *src_buffer;
GeglBuffer *destx_buffer;
const Babl *destx_format;
GeglBuffer *desty_buffer;
const Babl *desty_format;
GeglBuffer *vec_buffer;
GeglBuffer *mag_buffer = NULL;
GeglBuffer *grad_buffer;
gint width, height;
const Babl *src_format;
gint src_bytes;
const Babl *mformat = NULL;
gint mbytes = 0;
const Babl *vformat = NULL;
gint vbytes = 0;
const Babl *gformat = NULL;
gint gbytes = 0; /* bytes-per-pixel of various source drawables */
const Babl *dest_format;
gint dest_bytes;
gint dest_bytes_inc;
gint do_gradmap = FALSE; /* whether to add in gradient of gradmap to final diff. map */
gint do_vecmap = FALSE; /* whether to add in a fixed vector scaled by the vector map */
gint do_magmap = FALSE; /* whether to multiply result by the magnitude map */
guchar *destx, *dx, *desty, *dy; /* pointers to rows of X and Y diff. data */
guchar *tmp;
guchar *prev_row, *pr;
guchar *cur_row, *cr;
guchar *next_row, *nr;
guchar *prev_row_g, *prg = NULL; /* pointers to gradient map data */
guchar *cur_row_g, *crg = NULL;
guchar *next_row_g, *nrg = NULL;
guchar *cur_row_v, *crv = NULL; /* pointers to vector map data */
guchar *cur_row_m, *crm = NULL; /* pointers to magnitude map data */
gint row, col, offb, off, bytes; /* relating to indexing into pixel row arrays */
gint x1, y1, x2, y2;
gint dvalx, dvaly; /* differential value at particular pixel */
gdouble tx, ty; /* temporary x,y differential value increments from gradmap, etc. */
gdouble rdx, rdy; /* x,y differential values: real #s */
gdouble rscalefac; /* scaling factor for x,y differential of 'curl' map */
gdouble gscalefac; /* scaling factor for x,y differential of 'gradient' map */
gdouble r, theta, dtheta; /* rectangular<-> spherical coordinate transform for vector rotation */
gdouble scale_vec_x, scale_vec_y; /* fixed vector X,Y component scaling factors */
GimpDrawable *mag_map;
GimpDrawable *grad_map;
GimpDrawable *vector_map;
gdouble angle;
gdouble grad_scale;
gdouble vector_scale;
gdouble vector_angle;
gboolean use_mag;
gimp_ui_init (PLUG_IN_BINARY);
g_object_get (config,
"angle", &angle,
"mag-use", &use_mag,
"grad-scale", &grad_scale,
"vector-scale", &vector_scale,
"vector-angle", &vector_angle,
NULL);
/* ----------------------------------------------------------------------- */
if (grad_scale != 0.0)
do_gradmap = TRUE; /* add in gradient of gradmap if scale != 0.000 */
if (vector_scale != 0.0) /* add in gradient of vectormap if scale != 0.000 */
do_vecmap = TRUE;
do_magmap = (use_mag == TRUE); /* multiply by magnitude map if so requested */
/* Get the input area. This is the bounding box of the selection in
* the image (or the entire image if there is no selection). Only
* operating on the input area is simply an optimization. It doesn't
* need to be done for correct operation. (It simply makes it go
* faster, since fewer pixels need to be operated on).
*/
if (! gimp_drawable_mask_intersect (drawable,
&x1, &y1, &width, &height))
return;
g_object_get (config,
"mag-map", &mag_map,
"grad-map", &grad_map,
"vector-map", &vector_map,
NULL);
x2 = x1 + width;
y2 = y1 + height;
/* Get the size of the input image. (This will/must be the same
* as the size of the output image.
*/
width = gimp_drawable_get_width (drawable);
height = gimp_drawable_get_height (drawable);
src_format = get_u8_format (drawable);
src_bytes = babl_format_get_bytes_per_pixel (src_format);
/* -- Add two layers: X and Y Displacement vectors -- */
/* -- I'm using a RGB drawable and using the first two bytes for a
16-bit pixel value. This is either clever, or a kluge,
depending on your point of view. */
image = gimp_item_get_image (GIMP_ITEM (drawable));
selected_layers = gimp_image_list_selected_layers (image);
/* create new image for X,Y diff */
new_image = gimp_image_new (width, height, GIMP_RGB);
xlayer = gimp_layer_new (new_image, "Warp_X_Vectors",
width, height,
GIMP_RGB_IMAGE,
100.0,
gimp_image_get_default_new_layer_mode (new_image));
ylayer = gimp_layer_new (new_image, "Warp_Y_Vectors",
width, height,
GIMP_RGB_IMAGE,
100.0,
gimp_image_get_default_new_layer_mode (new_image));
draw_yd = GIMP_DRAWABLE (ylayer);
draw_xd = GIMP_DRAWABLE (xlayer);
gimp_image_insert_layer (new_image, xlayer, NULL, 1);
gimp_image_insert_layer (new_image, ylayer, NULL, 1);
gimp_drawable_fill (GIMP_DRAWABLE (xlayer), GIMP_FILL_BACKGROUND);
gimp_drawable_fill (GIMP_DRAWABLE (ylayer), GIMP_FILL_BACKGROUND);
gimp_image_take_selected_layers (image, selected_layers);
dest_format = get_u8_format (draw_xd);
dest_bytes = babl_format_get_bytes_per_pixel (dest_format);
/* for a GRAYA drawable, I would expect this to be two bytes; any more would be excess */
dest_bytes_inc = dest_bytes - 2;
/* allocate row buffers for source & dest. data */
prev_row = g_new (guchar, (x2 - x1 + 2) * src_bytes);
cur_row = g_new (guchar, (x2 - x1 + 2) * src_bytes);
next_row = g_new (guchar, (x2 - x1 + 2) * src_bytes);
prev_row_g = g_new (guchar, (x2 - x1 + 2) * src_bytes);
cur_row_g = g_new (guchar, (x2 - x1 + 2) * src_bytes);
next_row_g = g_new (guchar, (x2 - x1 + 2) * src_bytes);
cur_row_v = g_new (guchar, (x2 - x1 + 2) * src_bytes); /* vector map */
cur_row_m = g_new (guchar, (x2 - x1 + 2) * src_bytes); /* magnitude map */
destx = g_new (guchar, (x2 - x1) * dest_bytes);
desty = g_new (guchar, (x2 - x1) * dest_bytes);
/* initialize the source and destination pixel regions */
/* 'curl' vector-rotation input */
src_buffer = gimp_drawable_get_buffer (drawable);
/* destination: X diff output */
destx_buffer = gimp_drawable_get_buffer (draw_xd);
destx_format = get_u8_format (draw_xd);
/* Y diff output */
desty_buffer = gimp_drawable_get_buffer (draw_yd);
desty_format = get_u8_format (draw_yd);
pr = prev_row + src_bytes;
cr = cur_row + src_bytes;
nr = next_row + src_bytes;
diff_prepare_row (src_buffer, src_format, pr, x1, y1, (x2 - x1));
diff_prepare_row (src_buffer, src_format, cr, x1, y1+1, (x2 - x1));
/* fixed-vector (x,y) component scale factors */
scale_vec_x = (vector_scale *
cos ((90 - vector_angle) * G_PI / 180.0) * 256.0 / 10);
scale_vec_y = (vector_scale *
sin ((90 - vector_angle) * G_PI / 180.0) * 256.0 / 10);
if (do_vecmap)
{
/* bytes per pixel in SOURCE drawable */
vformat = get_u8_format (vector_map);
vbytes = babl_format_get_bytes_per_pixel (vformat);
/* fixed-vector scale-map */
vec_buffer = gimp_drawable_get_buffer (vector_map);
crv = cur_row_v + vbytes;
diff_prepare_row (vec_buffer, vformat, crv, x1, y1, (x2 - x1));
}
if (do_gradmap)
{
gformat = get_u8_format (grad_map);
gbytes = babl_format_get_bytes_per_pixel (gformat);
/* fixed-vector scale-map */
grad_buffer = gimp_drawable_get_buffer (grad_map);
prg = prev_row_g + gbytes;
crg = cur_row_g + gbytes;
nrg = next_row_g + gbytes;
diff_prepare_row (grad_buffer, gformat, prg, x1, y1 - 1, (x2 - x1));
diff_prepare_row (grad_buffer, gformat, crg, x1, y1, (x2 - x1));
}
if (do_magmap)
{
mformat = get_u8_format (mag_map);
mbytes = babl_format_get_bytes_per_pixel (mformat);
/* fixed-vector scale-map */
mag_buffer = gimp_drawable_get_buffer (mag_map);
crm = cur_row_m + mbytes;
diff_prepare_row (mag_buffer, mformat, crm, x1, y1, (x2 - x1));
}
dtheta = angle * G_PI / 180.0;
/* note that '3' is rather arbitrary here. */
rscalefac = 256.0 / (3 * src_bytes);
/* scale factor for gradient map components */
gscalefac = grad_scale * 256.0 / (3 * gbytes);
/* loop through the rows, applying the differential convolution */
for (row = y1; row < y2; row++)
{
/* prepare the next row */
diff_prepare_row (src_buffer, src_format, nr, x1, row + 1, (x2 - x1));
if (do_magmap)
diff_prepare_row (mag_buffer, mformat, crm, x1, row + 1, (x2 - x1));
if (do_vecmap)
diff_prepare_row (vec_buffer, vformat, crv, x1, row + 1, (x2 - x1));
if (do_gradmap)
diff_prepare_row (grad_buffer, gformat, crg, x1, row + 1, (x2 - x1));
dx = destx;
dy = desty;
for (col = 0; col < (x2 - x1); col++) /* over columns of pixels */
{
rdx = 0.0;
rdy = 0.0;
ty = 0.0;
tx = 0.0;
offb = col * src_bytes; /* base of byte pointer offset */
for (bytes=0; bytes < src_bytes; bytes++) /* add all channels together */
{
off = offb+bytes; /* offset into row arrays */
rdx += ((gint) -pr[off - src_bytes] + (gint) pr[off + src_bytes] +
(gint) -2*cr[off - src_bytes] + (gint) 2*cr[off + src_bytes] +
(gint) -nr[off - src_bytes] + (gint) nr[off + src_bytes]);
rdy += ((gint) -pr[off - src_bytes] - (gint)2*pr[off] - (gint) pr[off + src_bytes] +
(gint) nr[off - src_bytes] + (gint)2*nr[off] + (gint) nr[off + src_bytes]);
}
rdx *= rscalefac; /* take average, then reduce. Assume max. rdx now 65535 */
rdy *= rscalefac; /* take average, then reduce */
theta = atan2(rdy,rdx); /* convert to polar, then back to rectang. coords */
r = sqrt(rdy*rdy + rdx*rdx);
theta += dtheta; /* rotate gradient vector by this angle (radians) */
rdx = r * cos(theta);
rdy = r * sin(theta);
if (do_gradmap)
{
offb = col*gbytes; /* base of byte pointer offset into pixel values (R,G,B,Alpha, etc.) */
for (bytes=0; bytes < src_bytes; bytes++) /* add all channels together */
{
off = offb+bytes; /* offset into row arrays */
tx += ((gint) -prg[off - gbytes] + (gint) prg[off + gbytes] +
(gint) -2*crg[off - gbytes] + (gint) 2*crg[off + gbytes] +
(gint) -nrg[off - gbytes] + (gint) nrg[off + gbytes]);
ty += ((gint) -prg[off - gbytes] - (gint)2*prg[off] - (gint) prg[off + gbytes] +
(gint) nrg[off - gbytes] + (gint)2*nrg[off] + (gint) nrg[off + gbytes]);
}
tx *= gscalefac;
ty *= gscalefac;
rdx += tx; /* add gradient component in to the other one */
rdy += ty;
} /* if (do_gradmap) */
if (do_vecmap)
{ /* add in fixed vector scaled by vec. map data */
tx = (gdouble) crv[col*vbytes]; /* use first byte only */
rdx += scale_vec_x * tx;
rdy += scale_vec_y * tx;
} /* if (do_vecmap) */
if (do_magmap)
{ /* multiply result by mag. map data */
tx = (gdouble) crm[col*mbytes];
rdx = (rdx * tx)/(255.0);
rdy = (rdy * tx)/(255.0);
} /* if do_magmap */
dvalx = rdx + (2<<14); /* take zero point to be 2^15, since this is two bytes */
dvaly = rdy + (2<<14);
if (dvalx < 0)
dvalx = 0;
if (dvalx > 65535)
dvalx = 65535;
*dx++ = (guchar) (dvalx >> 8); /* store high order byte in value channel */
*dx++ = (guchar) (dvalx % 256); /* store low order byte in alpha channel */
dx += dest_bytes_inc; /* move data pointer on to next destination pixel */
if (dvaly < 0)
dvaly = 0;
if (dvaly > 65535)
dvaly = 65535;
*dy++ = (guchar) (dvaly >> 8);
*dy++ = (guchar) (dvaly % 256);
dy += dest_bytes_inc;
} /* ------------------------------- for (col...) ---------------- */
/* store the dest */
gegl_buffer_set (destx_buffer,
GEGL_RECTANGLE (x1, row, (x2 - x1), 1), 0,
destx_format, destx,
GEGL_AUTO_ROWSTRIDE);
gegl_buffer_set (desty_buffer,
GEGL_RECTANGLE (x1, row, (x2 - x1), 1), 0,
desty_format, desty,
GEGL_AUTO_ROWSTRIDE);
/* swap around the pointers to row buffers */
tmp = pr;
pr = cr;
cr = nr;
nr = tmp;
if (do_gradmap)
{
tmp = prg;
prg = crg;
crg = nrg;
nrg = tmp;
}
if ((row % 8) == 0)
gimp_progress_update ((gdouble) row / (gdouble) (y2 - y1));
} /* for (row..) */
gimp_progress_update (1.0);
g_object_unref (src_buffer);
g_object_unref (destx_buffer);
g_object_unref (desty_buffer);
g_clear_object (&mag_map);
g_clear_object (&grad_map);
g_clear_object (&vector_map);
gimp_drawable_update (draw_xd, x1, y1, (x2 - x1), (y2 - y1));
gimp_drawable_update (draw_yd, x1, y1, (x2 - x1), (y2 - y1));
gimp_displays_flush (); /* make sure layer is visible */
gimp_progress_init (_("Smoothing X gradient"));
blur16 (draw_xd);
gimp_progress_init (_("Smoothing Y gradient"));
blur16 (draw_yd);
g_free (prev_row); /* row buffers allocated at top of fn. */
g_free (cur_row);
g_free (next_row);
g_free (prev_row_g); /* row buffers allocated at top of fn. */
g_free (cur_row_g);
g_free (next_row_g);
g_free (cur_row_v);
g_free (cur_row_m);
g_free (destx);
g_free (desty);
*xl = GIMP_DRAWABLE (xlayer); /* pass back the X and Y layer ID numbers */
*yl = GIMP_DRAWABLE (ylayer);
}
/* -------------------------------------------------------------------------- */
/* The Warp displacement is done here. */
/* -------------------------------------------------------------------------- */
static void
warp (GimpDrawable *orig_draw,
GimpProcedureConfig *config)
{
GimpDrawable *disp_map; /* Displacement map, ie, control array */
GimpDrawable *mag_draw; /* Magnitude multiplier factor map */
GimpDrawable *map_x = NULL;
GimpDrawable *map_y = NULL;
gboolean first_time = TRUE;
gint iter_count;
gint width;
gint height;
gint x1, y1, x2, y2;
GimpImage *image;
/* index var. over all "warp" Displacement iterations */
gint warp_iter;
/* calculate new X,Y Displacement image maps */
gimp_progress_init (_("Finding XY gradient"));
/* Get selection area */
if (! gimp_drawable_mask_intersect (orig_draw,
&x1, &y1, &width, &height))
return;
g_object_get (config,
"warp-map", &disp_map,
"mag-map", &mag_draw,
"iter", &iter_count,
NULL);
x2 = x1 + width;
y2 = y1 + height;
width = gimp_drawable_get_width (orig_draw);
height = gimp_drawable_get_height (orig_draw);
/* generate x,y differential images (arrays) */
diff (disp_map, config, &map_x, &map_y);
for (warp_iter = 0; warp_iter < iter_count; warp_iter++)
{
gimp_progress_init_printf (_("Flow step %d"), warp_iter+1);
progress = 0;
warp_one (orig_draw, orig_draw,
map_x, map_y, mag_draw,
first_time, warp_iter, config);
gimp_drawable_update (orig_draw,
x1, y1, (x2 - x1), (y2 - y1));
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
first_time = FALSE;
}
image = gimp_item_get_image (GIMP_ITEM (map_x));
gimp_image_delete (image);
g_clear_object (&disp_map);
g_clear_object (&mag_draw);
}
/* -------------------------------------------------------------------------- */
static void
warp_one (GimpDrawable *draw,
GimpDrawable *new,
GimpDrawable *map_x,
GimpDrawable *map_y,
GimpDrawable *mag_draw,
gboolean first_time,
gint step,
GimpProcedureConfig *config)
{
GeglBuffer *src_buffer;
GeglBuffer *dest_buffer;
GeglBuffer *map_x_buffer;
GeglBuffer *map_y_buffer;
GeglBuffer *mag_buffer = NULL;
GeglBufferIterator *iter;
gint width;
gint height;
const Babl *src_format;
gint src_bytes;
const Babl *dest_format;
gint dest_bytes;
guchar pixel[4][4];
gint x1, y1, x2, y2;
gint x, y;
gint max_progress;
gdouble needx, needy;
gdouble xval=0; /* initialize to quiet compiler grumbles */
gdouble yval=0; /* interpolated vector displacement */
gdouble scalefac; /* multiplier for vector displacement scaling */
gdouble dscalefac; /* multiplier for incremental displacement vectors */
gint xi, yi;
gint substep; /* loop variable counting displacement vector substeps */
guchar values[4];
guint32 ivalues[4];
guchar val;
gint k;
gdouble dx, dy; /* X and Y Displacement, integer from GRAY map */
const Babl *map_x_format;
gint map_x_bytes;
const Babl *map_y_format;
gint map_y_bytes;
const Babl *mag_format;
gint mag_bytes = 1;
gboolean mag_alpha = FALSE;
GRand *gr;
gdouble amount;
gdouble dither;
gboolean use_mag;
gint substeps;
gr = g_rand_new (); /* Seed Pseudo Random Number Generator */
/* ================ Outer Loop calculation ================================ */
/* Get selection area */
if (! gimp_drawable_mask_intersect (draw,
&x1, &y1, &width, &height))
return;
g_object_get (config,
"amount", &amount,
"dither", &dither,
"mag-use", &use_mag,
"substeps", &substeps,
NULL);
x2 = x1 + width;
y2 = y1 + height;
width = gimp_drawable_get_width (draw);
height = gimp_drawable_get_height (draw);
max_progress = (x2 - x1) * (y2 - y1);
/* --------- Register the (many) pixel regions ---------- */
src_buffer = gimp_drawable_get_buffer (draw);
src_format = get_u8_format (draw);
src_bytes = babl_format_get_bytes_per_pixel (src_format);
iter = gegl_buffer_iterator_new (src_buffer,
GEGL_RECTANGLE (x1, y1, (x2 - x1), (y2 - y1)),
0, src_format,
GEGL_ACCESS_READ, GEGL_ABYSS_NONE, 5);
dest_buffer = gimp_drawable_get_shadow_buffer (new);
dest_format = get_u8_format (new);
dest_bytes = babl_format_get_bytes_per_pixel (dest_format);
gegl_buffer_iterator_add (iter, dest_buffer,
GEGL_RECTANGLE (x1, y1, (x2 - x1), (y2 - y1)),
0, dest_format,
GEGL_ACCESS_WRITE, GEGL_ABYSS_NONE);
map_x_buffer = gimp_drawable_get_buffer (map_x);
map_x_format = get_u8_format (map_x);
map_x_bytes = babl_format_get_bytes_per_pixel (map_x_format);
gegl_buffer_iterator_add (iter, map_x_buffer,
GEGL_RECTANGLE (x1, y1, (x2 - x1), (y2 - y1)),
0, map_x_format,
GEGL_ACCESS_READ, GEGL_ABYSS_NONE);
map_y_buffer = gimp_drawable_get_buffer (map_y);
map_y_format = get_u8_format (map_y);
map_y_bytes = babl_format_get_bytes_per_pixel (map_y_format);
gegl_buffer_iterator_add (iter, map_y_buffer,
GEGL_RECTANGLE (x1, y1, (x2 - x1), (y2 - y1)),
0, map_y_format,
GEGL_ACCESS_READ, GEGL_ABYSS_NONE);
if (use_mag)
{
mag_buffer = gimp_drawable_get_buffer (mag_draw);
mag_format = get_u8_format (mag_draw);
mag_bytes = babl_format_get_bytes_per_pixel (mag_format);
mag_alpha = gimp_drawable_has_alpha (mag_draw);
gegl_buffer_iterator_add (iter, mag_buffer,
GEGL_RECTANGLE (x1, y1, (x2 - x1), (y2 - y1)),
0, mag_format,
GEGL_ACCESS_READ, GEGL_ABYSS_NONE);
}
/* substep displacement vector scale factor */
dscalefac = amount / (256 * 127.5 * substeps);
while (gegl_buffer_iterator_next (iter))
{
GeglRectangle roi = iter->items[1].roi;
guchar *srcrow = iter->items[0].data;
guchar *destrow = iter->items[1].data;
guchar *mxrow = iter->items[2].data;
guchar *myrow = iter->items[3].data;
guchar *mmagrow = NULL;
if (use_mag)
mmagrow = iter->items[4].data;
/* loop over destination pixels */
for (y = roi.y; y < (roi.y + roi.height); y++)
{
guchar *dest = destrow;
guchar *mx = mxrow;
guchar *my = myrow;
guchar *mmag = NULL;
if (use_mag == TRUE)
mmag = mmagrow;
for (x = roi.x; x < (roi.x + roi.width); x++)
{
/* ----- Find displacement vector (amnt_x, amnt_y) ------------ */
dx = dscalefac * ((256.0 * mx[0]) + mx[1] -32768); /* 16-bit values */
dy = dscalefac * ((256.0 * my[0]) + my[1] -32768);
if (use_mag)
{
scalefac = warp_map_mag_give_value (mmag,
mag_alpha,
mag_bytes) / 255.0;
dx *= scalefac;
dy *= scalefac;
}
if (dither != 0.0)
{ /* random dither is +/- dither pixels */
dx += g_rand_double_range (gr, -dither, dither);
dy += g_rand_double_range (gr, -dither, dither);
}
if (substeps != 1)
{ /* trace (substeps) iterations of displacement vector */
for (substep = 1; substep < substeps; substep++)
{
/* In this (substep) loop, (x,y) remain fixed. (dx,dy) vary each step. */
needx = x + dx;
needy = y + dy;
if (needx >= 0.0)
xi = (gint) needx;
else
xi = -((gint) -needx + 1);
if (needy >= 0.0)
yi = (gint) needy;
else
yi = -((gint) -needy + 1);
/* get 4 neighboring DX values from DiffX drawable for linear interpolation */
warp_pixel (map_x_buffer, map_x_format,
width, height,
x1, y1, x2, y2,
xi, yi,
pixel[0], config);
warp_pixel (map_x_buffer, map_x_format,
width, height,
x1, y1, x2, y2,
xi + 1, yi,
pixel[1], config);
warp_pixel (map_x_buffer, map_x_format,
width, height,
x1, y1, x2, y2,
xi, yi + 1,
pixel[2], config);
warp_pixel (map_x_buffer, map_x_format,
width, height,
x1, y1, x2, y2,
xi + 1, yi + 1,
pixel[3], config);
ivalues[0] = 256 * pixel[0][0] + pixel[0][1];
ivalues[1] = 256 * pixel[1][0] + pixel[1][1];
ivalues[2] = 256 * pixel[2][0] + pixel[2][1];
ivalues[3] = 256 * pixel[3][0] + pixel[3][1];
xval = gimp_bilinear_32 (needx, needy, ivalues);
/* get 4 neighboring DY values from DiffY drawable for linear interpolation */
warp_pixel (map_y_buffer, map_y_format,
width, height,
x1, y1, x2, y2,
xi, yi,
pixel[0], config);
warp_pixel (map_y_buffer, map_y_format,
width, height,
x1, y1, x2, y2,
xi + 1, yi,
pixel[1], config);
warp_pixel (map_y_buffer, map_y_format,
width, height,
x1, y1, x2, y2,
xi, yi + 1,
pixel[2], config);
warp_pixel (map_y_buffer, map_y_format,
width, height,
x1, y1, x2, y2,
xi + 1, yi + 1,
pixel[3], config);
ivalues[0] = 256 * pixel[0][0] + pixel[0][1];
ivalues[1] = 256 * pixel[1][0] + pixel[1][1];
ivalues[2] = 256 * pixel[2][0] + pixel[2][1];
ivalues[3] = 256 * pixel[3][0] + pixel[3][1];
yval = gimp_bilinear_32 (needx, needy, ivalues);
/* move displacement vector to this new value */
dx += dscalefac * (xval - 32768);
dy += dscalefac * (yval - 32768);
} /* for (substep) */
} /* if (substeps != 0) */
/* --------------------------------------------------------- */
needx = x + dx;
needy = y + dy;
mx += map_x_bytes; /* pointers into x,y displacement maps */
my += map_y_bytes;
if (use_mag == TRUE)
mmag += mag_bytes;
/* Calculations complete; now copy the proper pixel */
if (needx >= 0.0)
xi = (gint) needx;
else
xi = -((gint) -needx + 1);
if (needy >= 0.0)
yi = (gint) needy;
else
yi = -((gint) -needy + 1);
/* get 4 neighboring pixel values from source drawable
* for linear interpolation
*/
warp_pixel (src_buffer, src_format,
width, height,
x1, y1, x2, y2,
xi, yi,
pixel[0], config);
warp_pixel (src_buffer, src_format,
width, height,
x1, y1, x2, y2,
xi + 1, yi,
pixel[1], config);
warp_pixel (src_buffer, src_format,
width, height,
x1, y1, x2, y2,
xi, yi + 1,
pixel[2], config);
warp_pixel (src_buffer, src_format,
width, height,
x1, y1, x2, y2,
xi + 1, yi + 1,
pixel[3], config);
for (k = 0; k < dest_bytes; k++)
{
values[0] = pixel[0][k];
values[1] = pixel[1][k];
values[2] = pixel[2][k];
values[3] = pixel[3][k];
val = gimp_bilinear_8 (needx, needy, values);
*dest++ = val;
}
}
/* srcrow += src_rgn.rowstride; */
srcrow += src_bytes * roi.width;
destrow += dest_bytes * roi.width;
mxrow += map_x_bytes * roi.width;
myrow += map_y_bytes * roi.width;
if (use_mag == TRUE)
mmagrow += mag_bytes * roi.width;
}
progress += (roi.width * roi.height);
gimp_progress_update ((double) progress / (double) max_progress);
}
g_object_unref (src_buffer);
g_object_unref (dest_buffer);
g_object_unref (map_x_buffer);
g_object_unref (map_y_buffer);
if (use_mag == TRUE)
g_object_unref (mag_buffer);
gimp_progress_update (1.0);
gimp_drawable_merge_shadow (draw, first_time);
g_rand_free (gr);
}
/* ------------------------------------------------------------------------- */
static gdouble
warp_map_mag_give_value (guchar *pt,
gint alpha,
gint bytes)
{
gdouble ret, val_alpha;
if (bytes >= 3)
ret = (pt[0] + pt[1] + pt[2])/3.0;
else
ret = (gdouble) *pt;
if (alpha)
{
val_alpha = pt[bytes - 1];
ret = (ret * val_alpha / 255.0);
};
return (ret);
}
static void
warp_pixel (GeglBuffer *buffer,
const Babl *format,
gint width,
gint height,
gint x1,
gint y1,
gint x2,
gint y2,
gint x,
gint y,
guchar *pixel,
GimpProcedureConfig *config)
{
static guchar empty_pixel[4] = { 0, 0, 0, 0 };
guchar *data;
gint wrap_type;
wrap_type = gimp_procedure_config_get_choice_id (config, "wrap-type");
/* Tile the image. */
if (wrap_type == WRAP)
{
if (x < 0)
x = width - (-x % width);
else
x %= width;
if (y < 0)
y = height - (-y % height);
else
y %= height;
}
/* Smear out the edges of the image by repeating pixels. */
else if (wrap_type == SMEAR)
{
if (x < 0)
x = 0;
else if (x > width - 1)
x = width - 1;
if (y < 0)
y = 0;
else if (y > height - 1)
y = height - 1;
}
if (x >= x1 && y >= y1 && x < x2 && y < y2)
{
gegl_buffer_sample (buffer, x, y, NULL, pixel, format,
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
}
else
{
gint bpp = babl_format_get_bytes_per_pixel (format);
gint b;
if (wrap_type == BLACK)
data = empty_pixel;
else
data = color_pixel; /* must have selected COLOR type */
for (b = 0; b < bpp; b++)
pixel[b] = data[b];
}
}
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